A group of scientists investigate a deadly new alien virus before it can spread.
Science fiction in the full sense of the word: an instant classic! Its aesthetics, especially the split-screen, may seem a bit dated, but they do fit the topic well.
On renewed view: still enjoy watching this science fiction classic.
Halliwell**: "Solemn and over-detailed but generally suspenseful thriller, with a sense of allegory about man's inhumanity to man."
Maltin**1/2: "Overlong sci-fi thriller..."